Elevating mechanism for drilling machines



"June 17, 1930. A. M. SOSA ET AL 1,764,810

' ELEVATING MECHANISM FOR DRILLING MACHINES Filed June 13, 1927 3 Sheets-Sheet 1 Iig- ;a'5-

Z2 r 34 i 2 47 5o 48 June 17, 1930. A, 5 El AL. 1,764,810

ELEVATING MECHANISM FOR DRILLING m cnmns Filed June 15, 1927 s Sheets-$116M; 2

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June 17, 1930. A M, SOSAETAL 1,764,810

ELEVATING MECHANISM FOR DRILLING mcnnms Filed June 15 1927 3 Sheets-Sheet 3 IAN/CIVTORES.

shaft and continuously rotatabl Patented June 17, 1930 PATENT OFFICE; 7

AUGUSTUS ivi. sosn, 0F CINCINNATI, AND W LLIAM G. HOELSCHER, or NORWOOD, OHIO, ASSIGNORS TO THE AMERICAN TOOL worms COMPANY, or CINCINNATI,

I OHIO, A CQRIBORATION OF OHIO ELEVATING. Mnonnmsie iron DRILLING MACHINES Application filed June is, 1

0 elevating mechanism for raising and lowering the drill-arm in a metal drillin'g'machine.

In metal drilling machinery there is usually a drive-shaft for imparting the desired rotative and feed movements to the drill-spindle, which drive-shaft rotates substantially continuously during the operation of the machine. There is also usually a train of gearing connected with the drive- 6 during the operation of the machine, for selectively ro- Our invention relates t tatin an elevatin screw or an elevatin nut D D b in reverse directions for raising or lowering thedrill-arm- In drilling machines as heretofore constructed this latter train of gearing has been directly connected with the driving means for operating the drill spindle, and, consequently, rotating throughout the time ofoperation of the machine.

. In practice, however, this train of gearing has a duty to perform only during the time that the drilharm is being raised or lowered. The time consumed in raising or lowering the drill-arm isin practice substantially negligible when compared with the time during whichthe drill-spindle is operated. In machines as heretofore constructed, however, thistrain of gearing for-performing the raising and lowering function of the drill-arm rotates all the time that the drilling machine is in use, thereby uselessly' consuming power and producing wear.

It is the object of our invention to soconstruct a drilling machine that the means for raising and lowering tllGCllill-Sljllldlfi shall be in train. with the driving means only during such time as the raising or lowering of the drill-arm is being performed, and to dissociate such train of gearing from the driving means during adjusted positions of the drill-arm, thereby preventing wear of such parts and avoiding the waste of power necessary to drive the same during the time the same are not in use. I

The invention will be further understood from the following desc and claims, and from thedrawings, latter: i q 7 Fig. 1 is a front elevation ot a radial-drillreadily ription in which o A drill-arm 31 is adjustable up and down wheel 87 which is arranged to rotate asuit- 1927; Serial No. 198,427.

ing machine, partly broken away, mg our invention. i

F ig. 2 is a rear elevati partly broken away.

Fig. 3 is a plan view of the drivinggearing for the elevating screw in the present exemplification of our invention, the top of he gear housing being removed. i

Fig. i is a vertical section of taken in the plane of the line l-j-i Fig. 5 is a vertical section of taken in the plane of theline 5-5 of Fig. 3.

Fig. 6 is an enlarged vertical section of a detail of our improved device, taken in the plane of the line 66 of Fig. 8.

' Fig. 7 is a plan section of the same, taken in the plane of the line 7-7 of Fig. 6.

Fig. 8 is an enlarged plan section of a detail of our improved device, taken in the plane of the irregular-line 88 of Fig. 9.

Fig. 9 is a vertical section of the same, taken in the plane of the irregular-line 99 of Fig. 8. r I

Fig. 10 is a detailed section, taken in the plane ofithe line 10-10 of F ig. 8.

Fig. 11 is a front elevation of a modifi:

embodyon of the same,

the same, of Fig. 3. the same,

cation of our improveddevice, partly broken 'about the post on suitable bearings Ql, 25,

and is arranged to be clamped to the post by a usual clamp 26 at the base of the column.

011 the column. It has a bearing 32 about the column, arranged to be clamped to the column by suitable clamps 83 for clamping the drill-arm in adjusted elevational posi tions on the column. A drill-slide 34 is adjustable laterally on guideways 35, 36, on the drill-arm, toward'and from the column, in suitable manner, as by means ofa hand able pinion meshing with a rack 38 secured to and extending lengthwise of the drill-arm.

The drill-slide has a suitable drill-spindle 41 journaled therein so as to be rotative and axially movable on the drill-slide in usual manner. A cross-shaft 42 extends lengthwise of the drill-arm and is journaled in bearings on the drill-arm, one of which is shown at 43. A drive-shaft 45 is coupled by a coupling 46 with the cross-shaft. This drive-shaft is a shaft suitably driven, and is exemplified as the power delivering shaft in a speed changing gear-box 47, mounted on and fixed to the drill-arm.

The gear-box contains suitable speed changing mechanism, suitably controlled, and exemplified as driven by an electric motor 48 secured to a bracket 49 on the drillarm. The rotor shaft of the electric motor is coupled with the receiving shaft of the gear-box by a suitable coupling 50. The parts are so constructed, related and arranged as to deliver various speeds to the drive-shaft for operating the drillspindle. The drive-shaft rotates substantially continuously during operation of the drilling machine.

The means exemplified for raising and lowering the drill-arm comprise a screw-rod 51 which has threaded connection with a nut 52 in the drill-arm, forming a pair ofcomplemental members, one of which is rotatable for raising and lowering the drill-arm. In the present instance the screw-rod is rotatable, and the nut is fixed in a socket 53 in the drill-arm, in which it is held non-rotative as by a set-screw .54. The means for rotating, the screw-rod in opposite directions for respectively raising and lowering the drillarm is exemplified as comprising a train of gears in a gear-housing 55 at the top of the column. The gear-housing is fixed to the upper end of the column,as by set bolts 56. The gear-housing rotates with the column.

The train of gearing comprises a drive gear 61, fixed tothe upper end of an upright shaft 62, journaled in a bearing 63 in the gear-housing at its upper end and in a bearing 64 at the lower end of the column. The upright shaft is received through a bearing-sleeve 65 journaled in bearings 66 ina bearing housing 67 secured to the drillarm, the bearing housing being exemplifiec as secured to the gear-box 47 fixed to the drill-arm.

The gear 61 meshes with a gear 70 which rotates with a gear 71, the gears 70, 71, being keyed together, as by a kev 72. The gears 70, 71, rotate on a stud-shaft 73, fixed in a bearing 74 of the gear-housing, as by a set-bolt 75. The gear 70 meshes with a gear 76 whic h rotates with a gear 77. The gears 76 and 77' are fixed together and rotate on a stud-shaft 78, fixed in a bearing 79 of the gear-housing, as by a set-bolt 80.

A gear 83 is fixed to the upper end of the screw-rod. This gear meshes with a gear 84, journaled on a stud-shaft 85, secured in a bearing 86 of one arm'of a rocking lever 88. The rocking lever has a bearing 89 journaled about abearing bushing 90 in the gear-housing 55. The bushing 90 forms an upper bearing for the screw-rod. The lower end of the screw-rod is received in a bearing 91 on the lower end of the column.

The gears 71, 77, rotate in opposite directions. The gear 84tis normally out of mesh with both said gears. hen brought into meshing relation with one of said lastnamed gears, the gear 84 is rotated in one direction for rotating the screw-rod in a given direction and lowering the drill'arm on the column. When the gear 84 is caused to mesh with the other of said gears, it is rotated in the opposite direction, the screwrod being oppositely rotated and the drillarm raised on the column.

It is necessary to unclamp the bearing 32 of the arm about the column prior to the raising or lowering of the drill-arm, the

bearing being again clamped on completion of the vertical ad ustment.

The rocking lever 88 comprises an operating arm. The rocking lever is operated by means of a rocker-rod 95, journaled at its lower end in a bearing 96 on the column and at its upper end in a. bearing 97 in the gear-housing 55. The rocker-rod is provided with a handle 98 extending radially therefrom for rocking the rod. A segment gear 99 is secured to the rocker-rod at its upper end. This segment gear meshes with a segment gear 100 on the operating arm of the rocking lever 88. The rocking movement of the rocking lever is limited by setbolts 101 in lugs 102 fixed to the rocker-rod 95, which set-bolts act as adjustable stops coacting with stop-faces 103 in the gearhousing. I

The drive-shaft 45 has a spiral gear 105 thereon, which coacts with a spiral gear 106 fixed to the sleeve 65, rotatable loosely about the upright shaft 62 and movable axially therealong with the drill-arm.

A clutch 111 is provided between the gear 106 and the upright shaft 62, and comprises clutch teeth respectively on the sleeve 65 and on a clutch collar 112. The collar has spline groove and key connection 113 with the shaft, for rotatively connecting said shaft with the gear 106 when the clutch teeth are engaged, and permitting the shaft to remain non-rotative when said clutch is disengaged. The clutch-collar has limited axial movements on the upright shaft 62 for engagement and disengagement of the clutch, and it also moves up and down with the drill-arm.

which extends from the gear-box. A pivotpin 118 is also fixed on this bracket.

A cam-piece 121 is pivoted about this pin, and has a cam 122 thereon, which has cam faces on its respective sides, which coact with pins 125, 126, which are fixed in the fork 115, and move the fork axially on the stud 116 by rotative movement of the campiece for engaging or disengaging the clutch.

The clutch is held in engaged or disengaged position by coaction of the pins with the flat faces 127, 12-8, on the cam-piece. A positioning ball131, which coacts with suitable recesses 132, 138, in the cam-piece, is resiliently held in said recesses by a spring 134 held in a socket 135 in the campiece by a threaded plug 136, may be provided to hold the cam-piece in adjusted positions. Stop-pins 129, 130, on the cam piece llmlt rocking movements thereof with relation to'the fork.

The cam-piece is provided with an operating arm 141, forming a lever, reaching to the operators side of the drill-arm for ready manipulation. i

In large sizes of drills, in which the drillarm might be raised to such height as to bring the operating handle 141 out of convenient reach of the operator, a control means removed from the cam-piece 121 is provided. a

Thus, referring to Figs. 11 and 12, the operating arm 141 is provided with a gearsegment 142, with which a gear-segment 143 meshes. The gear-segment 143 has a hub 144 journaled in a bearing 145 on the drill-arm. It has spline groove and key connection 146 with an upright shaft 147. The upright shaft is journaled in said hub. The lower end of this shaft is stepped in a bearing 148 at the lower end of the column. An operating handle 149 is fixed to the lower end of the upright shaft 147 within conven ient reach of the operator.

The clutch 111 is normally in disengaged relation, so that the shaft 62and the gears in the gear housing 55 directly connected and in continuous mesh therewith, remain idle during the usual operation of the drill ing machine. If it is desired to raise or lowerthe drill-arm, the clamps of the bearing of the drill-arm about the column are released, and the clutch 111 is engaged, for rotating the upright shaft 62 and the gears 61, 70, 7.1, 76 and 77, and, when the gear 84 is in mesh with either of the gears, 71 or 77, also rotating the gears 84 and S3 and the screw-rod 51, for raising or lowering the drill-arm, depending on whether the gear 84 is in mesh with the gear '71 or wise of the column, a nuton said with the gear 77. :I/Vhen the adjustment of the drill-arm has been accomplished, the clamps: 33 are again clamped. The clutch 111 is released when the adjustment of the drill-arin has been accomplished, for again placing the upright shaft 62 and the train of gears connected therewith'in non-rotative relation, thereby saving avoiding wear of the parts. i Ifaving thus fully described our inven tion,-what we claim as new, and desire to secure by Letters Patent, is:

1. In a drilling machine, the combination of a column, a drill-arm adjustable to elevation on said column, a drill-slide adjustable laterally on said drill-arm, a drillspindle on said drill-slide, driving means on said drill-arm including a. cross-shaftextending lengthwise of" said drill-arm for rotating said drill-spindle throughout the lateral adjustments. of. said drill-slide, said driving means substantially continuously rotating during operationof the machine, an upright screw extending lengthwise of the column, a nut on said drill-arm coacting with said screw, an upright shaft extending lengthwise of said column,'a gear-housing at the top of said column, a train of gears in said gear-housing between saidupright shaft and said upright screw for selectively rotating said upright screw in reverse direc-' tions for respectively raising and lowering said drill-arm into adjusted positions, a clutch including a, releasable clutch-member operativeiy connecting and disconnecting said driving means and said upright shaft, and a rockablecontrol cam provided with a plurality of cam-faces for axially moving said clutch-member in reverse directions and with resting 'faces for positioning said clutch-member in clutching relation and in unclutching relation, extending lengthwise of said column and having control connection with said clutchmember, and a handle on said rock-shaft below said drill-arm for operating said clutch-member.

2. In a drilling. machine, the combination of a column, a drill-arm adjustable to elevation on said column, a drill-slide adjustable laterally on said drill-arm, a drillspindle on said drill-slide, driving means on said drill-arm includingf'a cross-shaft extending lengthwiseof said drill-arm and movable tovelevation with said rotating said drill-spindle throughout the lateral adjustments of said drill-slide, said driving means substantially continuously rotating during operation of the machine, an upri ht rotatable screw extending lengthdrill-arm coacting with said screw and movable to elevation with said drill-arm, an upright shaft extending lengthwise of said column, a gear-housing at the top of said column,

power and 7 an upright rock-shaft:

drill-arm fora train of gears in said gear-housing between said upright shaft and said upright screw for selectively rotating said uprightscrew in reverse directions for respectively raising and lowering said drill-arm into adjusted positions on said column, a clutch movable to elevation with said drill-arm, said clutch including a releasable clutchmember operatively connecting and disconnecting said driving means with said upright shaft and arranged for permitting said upright shaft, said train of gears in said gear-housing and said screw to be non-rotative during such times as said drill-arm is in adjusted positions, a second upright shaft extending lengthwise of said column and having control connection with said releasable clutch-member, and a handle on said second upright shaftbelow said drill-arm for operating said second upright shaft and said releasable clutch-member.

3. In a drilling machine, the combination of a column, a drill-arm adjustable to eleva tion on said column, a drill-slide adjustable laterally on said drill-arm, a drill-spindle on said drill-slide, driving means on said drill-arm including a cross-shaft extending lengthwise of said drill-arm for rotating said drill-spindlethroughout the lateral adjustments of said drill-slide, said driving means substantially continuously rotating during operation of the machine, an upright rotatable screw extending lengthwise of the column, a nut on said drill-arm coacting with said screw, an upright shaft extending lengthwise of said column, a gear-housing at the top of said column, a train of gears in said gear-housing between said upright shaft and said upright scre'wfor selectively rotating said upright screw in reverse directions for respectively raising and lowering 7 said drill-arm into adjusted positions on said column, a clutch movable to elevation with said drill-arm and including a releasable clutch-member on said drill-arm operatively connecting and disconnecting said substantially continuously rotatable driving means with said upright shaft and for permitting said upright shaft, said train of gears in said gear-housing and-said screw to be nonrotative during such times as said drill-arm is in adjusted positions, control means for said releasable clutch-member including a part provided with opposite cam faces and a coacting part therefor constituting coacting control members, and a handle for moving one of said members. 7 In testimony whereof we have hereunto signed our names.

AUGUSTUS M. SOSA; WILLIAM G. HOELSCHER. 

